Sewing machine



y 1935- 1 c. F. RUBEL I 2,002,799

SEWING MACHINE 4 Sheets-Sheet 1 Filed Feb. 3. 1934 May 28, 1935. c. F.RUBEL SEWING MACHINE Filed Feb. 3, 1954 4 Shets-Sheet 2 C. F. RUBELSEWING MACHINE May 28, 1935.

4Sheets-Sheet 3 Filed Feb. 3. 1934 C. F. RUBEL SEWING MACHINE 4Sheets-Sheet 4 Filed Feb. 3. 1954 C 9 m 5 w i F a 0 \||.||l .W Z p a 0 aw J 2 J 11 H. a 5 g 6 2 a w a 9 7// Patented May 28, 1935 UNITED STATESPATENT OFFICE SEWING MACHINE Charles F. Rube], Chicago, 111., assignorto Union Special Machine Company, Chicago, 111., a corporation ofIllinois Application February a, 1934, Serial No. 709,645

9 Claims. (01. 112- 215) The invention relates to new and useful im- 25,1930, No. 1,751,508. In this machine, the main provements in sewingmachines, and more paractuating shaft is located above the worksupticularly to the driving mechanism for the main port and extends inthe general direction of the actuating shaft and the devices operatedthereby line of feed. It is offset slightly to the line of for actuatingthe feed. I feed, and is disposed in a plane which is inclined 5 Anobject of the invention is to provide a sewto said line of feed. "Thefabric is moved across ing machine wherein the main actuating shaft theWork support by a feeding mechanism which is drivenby a connectionthereto intermediate the includes a-feeddog carried by a feed bar. Theends thereof, and wherein the feed dog is actupresent invention hasparticularly to do with the 10 ated for feeding the fabric by a driving.connecmeans whereby the main actuating shaft located 10 tion at the endof said actuating shaft. in the standard above the work support is op- Afurther object of the invention is to proerated and the devices whichare actuated by said vide a machine of the above type wherein the shaftfor imparting feeding movements-to the feed dog is moved back and forthfor imparting feed dog. The main actuating shaft is operated a feedingmovement to the fabric by a crank from a driving pulley located at theside'of the 5 which is adjustably mounted on a disk carried at standardand the actuating shaft. This pulley is the end of theactuating shaft 7carried by a short shaft which is provided with A still further objectof the invention is to proa bevel gear meshing with a bevel gear locatedvide a machine of the above'type with a feeding on the actuating shaftintermediate the ends mechanism wherein the feed bar carrying the feedthereof. This leaves the ends of the main actuat 20 dog is moved endwisethrough a connection with ing shaft free. The rear end of the actuatingthe rocker oscillated by-an actuating crank at shaft is provided with adisk carrying a crank the end of the mainactuating shaft, and whereinwhich is adjustable in a radial slot therein, and the feed bar is raisedand lowered by an oscillatthis crank actuates the link which isconnected ing lever connected to the feed bar by a link and to an armcarried by the feed rocker, and the 25 given its oscillations by aneccentric strap (:0- feed bar is pivotally attached to this feed rocker;operating with an eccentric on the main actuating thus it is that thefeed bar is moved back and shaft, forth. Mounted on the fulcrum shaftfor the These and other objects will in part be obvious feed rocker is alever which swings independently 3o andwill in part be hereinafter morefully deof the feed rocker. This lever isconnected at its scribed. iouter end to a link which is attached at its up- In the drawings a perend to the feed bar. The leveris raised Figure 1 is a plan view of themachine embodyand lowered by y an eccentric ap which has a ing theimprovements; i direct connection thereto, and this eccentric, strapFig. 2 is a side view of the machine withparts cooperates with aneccentric on the main actuat 35 broken away and parts in section to showmore ing shaft. This provides a very eflicient actuating particularlythe mechanism for operating the feed means for the feed dog which iscapable of d0g;y a handling heavy materials where the strain in- I Fig.3 is a sectional view on the line 33 of cident to the clamping of thematerial and the m Fig. 2; moving of the same is much greater than the40 Fig. 4 is a view showing more or less diagramnormal strains imposedupon the feed dog in ordimatically and in side elevation, the means fornary stitching. Furthermore, the feeding mechaoscillating the feedrocker; nism is such as to enable the feed dog to be given Fig. 5' is, aview from the rear of the machine a relatively long stroke and thus longstitches showing the end of the actuating shaft, the feed produced.

rocker andthe means for imparting oscillations Referring more-in detailto the drawings, the to the feed rocker from said actuating shaft;invention is shown as applied to a sewing machine Fig. 6 is a planviewpartly in section showing which includes a supporting bed I. Saidsupportthe actuating arm for raising and lowering the ing bed I isprovided with suitable supporting 5o feed bar, and V members on which aworksupport 2 is rigidly Fig. 7 is a sectional view showing the mannerof mounted. Mounted on the bed and extending upadjusting the feedactuating crank. wardly therefrom is a standard 3 which is pro- Theinvention is shown as applied to a machine vided with bearings, and themain actuating shaft of the type disclosed in the patent granted Nor- 4is mounted for rotation in the bearings carried 55,. man V. Christensenand Frederick F. Zeier, March by this standard. This main actuatingshaft 4 is located above the work support 2. Said shaft inclinesdownwardly relative to the plane of the work support, and as clearlyshown in Fig. 1, the shaft also is disposed in a vertical plane which isinclined to the line of feed.

The machine includes a needle bar carrying a needle 6, and cooperatingwith the needle it beneath the work support is a'looper l. The looper Iis mounted on a looper carrier 8 which is oscillated by suitableconnections with an eccentric strap 9. The looper is given its needleavoiding movements by means of an arm M which carries a ball stud towhich an eccentric strap H is connected. The stitch forming mechanismforms no part of the present invention.

The material is held on the work support 3 by a presser foot l2 and isfed across the worksupport to the stitching mechanism by means of a feeddog 13. The feed dog i3 is carried by a feed bar M. Said feed dog isprovided with a shank i5 which is slotted, anda screw [6 passing throughthe slot rigidly clamps the feed dog to the feed bar. The feed bar atits rear end is fixed to a pin I? and the pin I! is journaled in thearms [8, [8 carried at the'upper end of the feed'rocker I9. The feedrocker i9 is provided with arms 20, 2a which are journaled on a fixedshaft 260. mounted at one end in thestandard 3, and mounted at the otherend in a supporting member carried by the bed and carrying the worksupport.

The feed rocker is oscillated by a plate 25 which is fixed thereto andcarries a rearwardly projecting arm 22. Said plate is attached to thefeed rocker by suitable screws 23, 23 one of which is shown in Fig. 5.At the outer end of said arm 22 is a ball stud 24. A link 25 isconnected to the bail stud. On the rear end of the main actuating shaft4 is a disk 26 which is fixed thereto by set screws 21, 21. This disk isprovided with a radial slot, and mounted in said radial slot is a crankpin 29. The radial slot is T-shaped in cross section, and the crank pinhas a T-shaped head which slides therein. Carried by the crank pin isthe inner end, said lever is connected to a link 31. Said link is forkedat its lower end, and the end of the lever extends into the fork, andthe pivot pin 38 joins the link to the lever. The upper end of the linkis likewise forked and the feed bar [4 lies in said fork and is securedto the link by a pivot pin 39. Attached to this lever 35 is a stud 49carrying a ball with which an eccentric strap ll is attached. Theeccentric strap 4| cooper ates with an eccentric 42 on the mainactuating shaft 3. As the main actuating shaft rotates, it will impartendwise movement to this eccentric strap di, and this will in turnoscillate the lever, raising and lowering the inner end thereof. Thismovement imparted to the lever 35 will give an endwise movement to thelink 3? which will raise and lower the feed bar.

From the above it will be apparent that a driving means for the mainactuating shaft has been provided which is connected theretointermediate the ends of the actuating shaft. The feed dog derives itsmovements from actuated parts directly connected to this actuatingshaft. The feed rocker which gives fabric feeding movements to the feeddog is oscillated by a crankpin at the rear end of the shaft, and thelever which raises and lowersthe feed dog is actuated by an eccentricstrap which is directly connected thereto and which cooperates with aneccentric on the actuating shaft disposed intermediate the ends thereof.This provides a very efiicient and simple, feeding mechanism which isespecially adapted for heavy work, and for producing relatively longstitches. The crank pin carried by the disk may be adjusted through awide range and a sufiicient throw obtained for the longest stitchdesired. As a means for lubricating the gears through which the mainactuating shaft is rotated, a housing 43 is provided which completelyhouses said ears, and this housing may be supplied with a lubricat-v ingoil so that the gears will run in oil.

It is obvious that minor changes in the details of construction may bemade without departing carried thereby, a link connecting said ballstuds,

a lever mounted beneath the feed bar for oscillations in a verticalplane, a link connecting the free end of said lever with the free end ofsaid feed bar, an eccentric on said main actuating shaft, an eccentricstrap cooperating therewith, and a ball stud carried by said lever towhich said eccentric strap is attached.

4. In a sewing machine, a work support, a main actuating shaft locatedabove the work support, a feed bar, means operated by said mainactuating shaft for imparting endwise movement to the feed bar, a levermounted beneath the feed bar for movement in a vertical plane, a linkconnecting the free end of said lever to 7 the free end of the feed bar,an eccentric strap cooperating with an eccentric on the main actuatingshaft, and a ball stud carried by said lever to which said eccentricstrap is connected.

5. In a sewing machine, a work support, a main actuating shaft locatedabove the work support, driving means for said main actuating shaftconnected thereto intermediate the ends thereof, a feed bar, means forimparting endwise movement to the feed bar including a feed rocker towhich said feed bar is pivoted, a plate secured to the feed rocker andhaving an arm projecting rearwardly therefrom, a ball stud carried bysaid arm, a disk on the rear end of said actuating shaft, a crank pinmounted for radial adjustment on said disk, and a link connecting saidcrank pin to said ball stud for oscillating said feed rocker.

6. In a sewing machine, a work support, a main actuating shaft locatedabove the work support, driving means for said main actuating shaftconnected thereto intermediate the ends thereof, a feed bar, means forimparting endwise movement to the feed bar including a feed rocker towhich said feed bar is pivoted, a plate secured to the feed rocker andhaving an arm projecting rearwardly therefrom, a ball stud carried bysaid arm, a disk on the rear end of said actuating shaft, a crank pinmounted for radial adjust ment on said disk, and a link connecting saidcrank pin to said ball stud for oscillating said feed rocker, said linkincluding an intermediate adjustable section whereby the length of thelink may be variedfor varying the working position of the feed dog.

'7. In a sewing machine, a work support, a main actuating shaft locatedabove the work support, driving means for said main actuating shaftconnected thereto intermediate the ends thereof, a feed bar, meansforimparting end- .wise movement to the feed bar including a feed rocker towhich said feed bar is pivoted, a plate secured to the feed rocker andhaving. an arm projecting rearwardly therefrom, a ball stud carried bysaid arm, a disk on the rear end of said actuating shaft, a crank pinmounted for radial adjustment on said disk, a link connecting said crankpin to said ball stud for oscillating said feed rocker, means forclamping said crank pin in a fixed position on said disk, and means forshifting said crank pin when released to different set positions. 1

8. In a sewing machine, a work support, a main actuating shaft locatedabove the work support, a feed bar, a feed rocker to which said feed baris pivotally connected, means for oscillating said feed rocker from saidmain actuating shaft, a stationary shaft on which said feed rocker ismounted for oscillation, a lever mounted on said stationary shaft foroscillation in a vertical plane independently of said feed rocker, alink pivoted to the free end of said lever and pivoted to the free endof said feed bar, said link being disposed in substantially a verticalposition, a ball stud carried by said lever, an accentric on said mainactuating shaft, and an eccentric strap cooperating with said eccentricand connected to said ball stud for oscillating said lever.

9. In a sewing machine, a work support, a mai actuating shaft locatedabove the work support,

an operating shaft disposed at right angles to the CHARLES F. RUBEL.

